h3-print
v4.0.0
Published
Silent printing module for Expo Android - supports HTML to PDF conversion and direct thermal printing
Maintainers
hakoblotReadme
h3-print
Silent printing module for Expo Android - supports HTML to PDF conversion and direct thermal printing without system dialog.
Installation
npm install h3-print
# or
yarn add h3-printFeatures
- 🖨️ Silent printing (bypasses Android print dialog)
- 📄 HTML to PDF conversion
- 🧾 Optimized for thermal/receipt printers
- 📱 Works with custom Android print services
- ⚡ ESC/POS command support
Usage
Basic HTML Printing
import * as H3Print from 'h3-print';
const html = `
<html>
<body>
<h1>Receipt</h1>
<p>Thank you for your purchase!</p>
</body>
</html>
`;
const result = await H3Print.printHtmlAsPdf(html, {
pageWidth: 384, // 48mm at 203dpi
packageName: 'com.bld.settings.print', // Your device's print service
});
console.log(result);Check Print Service Availability
const status = await H3Print.isPrintServiceAvailable();
console.log('Available:', status.available);List Available Print Services
const packages = await H3Print.getAllPrintCapablePackages();
console.log('Print services:', packages);API
Main Functions
| Function | Description |
|----------|-------------|
| printHtmlAsPdf(html, options?) | Convert HTML to PDF and print silently |
| generatePdfFromHtml(html, options?) | Generate PDF without printing |
| printPdf(filePath, packageName?) | Print existing PDF file |
| printText(text, packageName?) | Print plain text |
| printRaw(data, packageName?) | Print raw ESC/POS bytes |
Options
interface PdfOptions {
pageWidth?: number; // Default: 384 (48mm at 203dpi)
pageHeight?: number; // Default: 0 (auto)
fileName?: string; // Custom filename
packageName?: string; // Print service package
saveToPublic?: boolean; // Save to Documents folder
}Requirements
- Expo SDK 51+
- Android device with a compatible print service
License
MIT
### LICENSEMIT License
Copyright (c) 2024 cob-byte
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.